We have a fairly large legacy installation of Catalyst 3500s interconnected with 62.5 MMF. Most of the links more than 200m or so have these old Allied Telesyn EX-1002 "range extenders" which are alleged to be able to run up to 2km over MMF without the use of mode conditioning cables. And they do seem to be work as stated, we hve a couple runs just shy of 1km and they have been staying up.
The EX-1002s are starting to die off and I can't find a similar product. Actually, I can't find any technical information at all on the EX-1002, they say "1000-baseX" and seem to be longwave. Since they are said to operate at 2km, is mode conditioning built-in to the device?
The only other way around this is to use generic LX/LH GBICs and mode conditioning cables, which are very expensive. Or maybe just buy some EX-1002s on Ebay?
But, is there a GBIC available that is Catalyst 3500 compatible that can do long-haul multimode gigabit?
St Marys College of CA
"I think the easiest solution in the short term will be to get some mode conditioning cables"
If you already have LX optics then going with mode conditioning patch chord and looks the best solution.
There doesn't seem to be such a beast as a "mode conditioning GBIC" I suppose the required tolerances are easier to fabricatre in a cable than in the GBIC itself.,
if with the one you were using without any extra cable then they would have built cable within the module.It is possible to do mode conditioning patch feature in GBIC module but cost will be the factor i think. As i know fiber based coupler were cheaper than chip based but it is true only for 2X2 couplers once you increase the number of ports like 4, 8 16. .. then things changed.
One more thing, In case of cisco LX module they cannot fix in that module as the same module is used for SMF also. So the module you have can go 10Km with SMF and 2Km with mode conditioning patch cable over MMF.
We even have good luck operating SX up to 400m or so, but this is with newer SFP form factor optics that say they are laser product
Are you getting 400m with SX over OM3 (MMF ) or 62.5 MM. Getting distance with MMF over some distance is very difficult because of certian problem . Even if i increase the power , dispersion will not let me go beyond some distance.
google for word "gigabit ethernet multimode extender"
there are suppliers like MRV communication, rad direct etc others who are making such thing. Hope they have some.